Python - How To Convert List of Strings to Integer in Python

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This tutorial will explain various methods to convert a list of strings to a list of integers in Python. In many cases, we need to extract numerical data from strings and save it as an integer; for example, it can be a price of an item saved as a string or some identity number saved as a string.

Python Convert List of Strings to Integers Using the `map()` Function

The `map(function, iterable)` function applies `function` to each element of the `iterable` and returns an iterator.

To convert a list of strings to the list of integers, we will give `int` as the `function` to the `map()` function and a list of strings as the `iterable` object. Because the `map()` function in Python 3.x returns an iterator, we should use the `list()` function to convert it to the list.

``string_list = ['100', '140', '8' ,'209', '50' '92', '3'] print(string_list)  int_list = list(map(int, string_list)) print(int_list) ``

Output:

``['100', '140', '8', '209', '5092', '3'] [100, 140, 8, 209, 5092, 3] ``

Python Convert List of String to Integers Using List Comprehension Method

The other way we can use to convert the list of strings to the list of integers is to use list comprehension. The list comprehension creates a new list from the existing list. As we want to create a list of integers from a list of strings, the list comprehension method can be used for this purpose.

The code example below demonstrates how to use the list comprehension method to convert a list from string to integer.

``string_list = ['100', '140', '8' ,'209', '50' '92', '3'] print(string_list)  int_list = [int(i) for i in string_list] print(int_list) ``

Output:

``['100', '140', '8', '209', '5092', '3'] [100, 140, 8, 209, 5092, 3] ``